Question

In C++ the syntax to declare a variable is: datatype variablename; Which of the following C++ declarations are invalid?​

Answer 1

Answer:

written below-

Explanation:

Variables are the name to memory space in the computer where we can store data of certain types. They are important component of any programming language. In C++, each variable has its type which defines the type of value that can be stored by the variable, size taken by that variable and its range. Some basic types of variables in C++ are int, float, bool, char, etc.

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Answer 2

Answer:

Concept:

A variable, or value, is a container for a certain set of bits or type of data in computer programming. A variable is an abstract storage place with an associated symbolic name that holds some known or unknown quantity of information. Eventually, a memory address may be used to link or identify a variable. In addition to using the variable name or the variable itself, depending on the situation, the stored value is typically referenced by the variable name. The name can be used independently of the precise information it conveys thanks to the separation of name and content.

Given:

Which of the preceding C++ declarations is invalid? The syntax for declaring a variable in C++ is: datatype variablename;

Find:

Find Invalid variables in c++

Answer:

The word for the area of computer memory where specific types of data can be stored is a variable. They are crucial parts of every programming language. Each variable in C++ has a type that specifies the kind of value it can hold, the size it takes, and the range it has. In C++, fundamental variable types include int, float, bool, char, etc.

Before utilising a variable in C++, it must first be declared. Declaring a variable lets the compiler know that it's going to be utilised in the programme and of what type. An error will occur if a variable is used before it has been declared.

For instance, the variable names var, X, _name, etc. are acceptable, however 1a, $age, etc. are not. Variable names may only contain the letters A through Z, the underscore (_), and the digits 0 through 9, but they cannot contain extra symbols like %, &, @, and so forth. For instance, the variables a_01 and findSum are OK, but C++ does not permit name& and calc% percent. Some invalid variable names are: 1user, %1age, v@lue, !!, *name*, etc.

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